Brake



April 23, 1935. K, M, YOST 1,998,647

BRAKE Filed Oct. 4, 1933 q) Vk 80 94 40 78 67 697051077 a? v 4 0 IN V ENTOR. 60 7 7 k KOF/ V057 7 kin- 2 -69! ATTORNEY.

Patented Apr. 23, 1935 UNITED STATES PATENT OFFICE BRAKE ApplicationOctober 4, 1933, Serial No. 692,079

2 Claims.

This invention relates to brakes and operating mechanism therefor, andis illustrated by a cable operated brake system.

One of the objects of the invention is to provide an operating systemwhich will be efiicient to apply the brakes under the most adverseconditions. Specifically, the system will be operative even though partof the connections leading to the brakes are broken and also even thoughsome of the brakes are jammed.

Heretofore systems have been designed which were capable of operatingefiiciently in the event of a happening causing one of these adverseconditions. However, so far as I am aware, never heretofore hasprovision been made in the same mechanism for the prevention of theadverse results of both occurrences.

One of the features of the invention is the provision of a pair of crossshafts connected by a novel equalizer bar.

A further feature of the invention is an equalizer bar and itsconnections so designed that the equalizing movement of the bar islimited.

Futher features and objects of the invention should be apparent after areading of the subjoined specification and claims, and after aconsideration of the accompanying drawing, in

which:

Figure 1 is a plan view of an automobile equipped with a brake operatingsystem constructed according to my invention;

Figure 2 is a fragmentary view inside elevation taken substantially onthe line 2-2 of Figure 1;

Figure 3 is a view in vertical section taken substantially on the line3--3 of Figure 1;

Figure 4 is a. fragmentary view in front elevation, but with parts insection designed to show the brake operating cross shafts; and

Figure 5 is a view in horizontal section of a detail of the equalizerbar and brake operating connections.

Referring particularly to the drawing, I have shown a chassis of anautomobile comprising a frame formed of side rails I0 and I2 and X-framemembers I4, I6, I8, and 20. The X-frame members are secured to eachother by a saddle formed by a pair of plates such as the plate 22. TheX-frame members are'also secured to the side rails I0 and I2. The frameis supported through front and rear axles 24 and 26 on front road wheels28 and 30 and on rear road wheels 32 and 34. The front road wheels areprovided with drum brakes 36 and 38 and the rear road wheels areprovided with drum brakes 40 and 42.

For operating the brakes I provide mechanism including a pair ofparallel laterally extending cross shafts 44 and 46 rotatably mounted inbearings in the side frame rails I0 and I2.

The shafts 44 and 46 are adapted to be rotated by a foot pedal 48. Thispedal 48 is sleeved for 5 rotation on cross shaft 44 (see Figures 4 and5) and is provided with a downwardly extending projection 49 formed witha hole 50 and with a pair of laterally extending arms 52 and 54.

Extending through the hole 50 is a short equalizer bar 56 formed at itscentral portion with a rounded bearing surface 58, and with reduced endportions 60 and 62.

Keyed to the shaft 44 is a hub 64 which has a downwardly extending arm66. The arm 66 is 15 formed with a hole which is slightly larger thanthe end 60 of the bar 56. Said end 60 extends through said hole and issecured therein by a Washer 61 and cotter pin 68. On the opposite sideof the arm 66, a spring 69 is interposed be- 20 tween the arm and awasher 10, which in turn abuts a shoulder formed between the mainportion of the bar 56 and the reduced end 60. The spring thus aids inpositioning the equalizer bar.

The shaft 46 has keyed thereto a hub II formed with a downwardlyextending arm 12 pivotally connected at I3 to a link I4. The link 14 isprovided at its opposite end with a slot I6 for the purpose of allowingat certain times, a lost motion connection. This slot fits over the end62 of the bar 56, being fastened thereon by a washer 18 and a cotter pinand held in position by a washer 82 and a spring 84.

Thus it may be seen that force applied to the pedal is normally istransmitted through the 35 equalizer bar 56 to transmit equal pressuresto rotate the cross shaft 44 and 46 both in a counterclockwise direction(as viewed in Figures 2 and 3). However, should one linkage break, oneof the arms 52 and 54 contacts with the bar 56 40 to insure theapplication of the uninjured set of brakes.

Means are provided for transmitting to the brakes the force so appliedto the cross shafts, 44 and 4s. A pair of hubs86 and as having down- 45wardly extending arms 90 and 92, are secured to the shaft 44. Connectedto the lower ends of the arms 90 and 92 are tension connections 94 and96 extending forward to the brakes 36 and 38 and passing adjacent theirforward ends through the conduits 98 and I00. Similarly, the shaft 46has keyed thereto a pair of hubs I02 and I04 having respectivelyupwardly extending arms I06 and I08, to the ends of which are connectedrearwardly extending tension elements H8 and H2. The tension elementsextend rearwardly to the brakes 48 and 42 passing adjacent to theirrearward ends through conduits H4 and H6.

The hub 88 also has formed therewith an upwardly extending projectionII8 which is adapted to contact with a stop member I28 secured to theside rail I2. The projection II8 thus serves to limit the returnmovement of the cross shaft 44.

Means are provided for applying the rear brakes independently of thefront brakes and independently of the pedal 48. A hand lever I22 ispivoted on a bracket I24 secured to the side rail I2. The lever I22 isconnected by a pivoted link I26 with an arm I28 keyed to the cross shaft46. A slot I38 in the link I26 allows the operation of all of the brakesby the pedal without movement of the hand lever. Similarly, the slot I6in the end of the link I4 allows the rotation of the shaft 46 and theapplication of the rear brakes without movement of the shaft 44 or thepedal 48.

The bracket I24 is provided with teeth I48 with which a pawl I42 pivotedon the lever I22 coacts to releasably hold the lever I22 in any desiredposition.

As noted above, the projection II8 coacts with the stop member I28 tolimit the return movement of the cross shaft 44. The arm I28 coacts withthe slot I38 to limit the return movement of the shaft 46.

A clutch pedal I44 is mounted on the shaft 44, but is not material tothe brake operation described.

It is believed that the operation of the brake operating system will bereadily understood as previously described. Movement of the pedal 48operates to apply equal forces to rotate shafts 44 and 46. These forcesare transmitted through the arms 88, 92, I86, and I88 and tensionconnections 94, 86, H8, and H2 to the brakes 36, 38, 48, and 42. Forceapplied to the hand lever I22 acts through the link I26, the arm I28,the cross shaft 46, the tension connections H8 and H2 to operate therear brakes 48 and 42.

It may be thus seen that I have provided an efiicient brake operatingsystem. Normally, all of the brakes are operated by the pedal 48 and thefront and rear systems are equalized through the bar 56. Should anybrake jam for any cause, nevertheless the operator could, through thepedal, operate the front brakes or the rear brakes. Moreover, should anyconnection break, the arms 52 and 54 insure that the other set of brakesmay be operated through the pedal. In addition, the rear brakes may beoperated entirely independently through the hand lever I22.

It is to be understood that the above described embodiments of myinvention are for the purpose of illustration only and various changesmay be made therein without departing from the spirit and scope of myinvention.

I claim:

1. A brake system comprising a pair of separate sets of brakes, a firstcross shaft, a second cross shaft, a pedal pivoted on said first crossshaft and provided with an extension, an equalizer bar pivoted on theextension, a hub secured to the first cross shaft, an arm on the hubconnectedto one end of the equalizer bar, a connection between the otherend of the equalizer and the second shaft, means'for transmitting brakeapplying force from said first shaft to one of said sets of brakes,means for transmitting force from said second shaft to the other set ofbrakes, and a hand lever connected to said second shaft.

2. A brake system comprising a pair of separate sets of brakes, a firstcross shaft, a second cross shaft, a pedal pivoted on said first crossshaft and provided with an extension, an equalizer bar pivoted on theextension, a hub secured to the first cross shaft, an arm on the hubconnected to one end of the equalizer bar, a connection between theother end of the equalizer and the second shaft, means for transmittingbrake applying force from said first shaft to one of said sets ofbrakes, and means for transmitting force from said second shaft to theother set of brakes.

' KARL M. YOST.

